UV Projection not working
The UV project modifier requires a lot of geometry to project the image properly.

Either subdivide your geometry manually by switching into Edit Mode &gt; RMB &gt; Subdivide (also accessible from the Edge menu) or just add a Subdivision Surface modifier to your geometry and set it to Simple which essentially does the same but in a non-destructive way:

No UVs are required but you'd have to make sure that the Aspect Ratio of the image matches the X and Y properties of the modifier eg. for a 16:9 or 4:3 image, set the values accordingly:

Related: Camera projection without generating UV&#39;s?